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Susceptibility Weighted Imaging (SWI)

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    The performance of detecting CMBs has been enhanced by advances in magnetic resonance imaging (MRI) technology. In paramagnetically sensitive MR sequences such as Susceptibility weighted imaging (SWI) [12,13] or T2 GRE [1]. In the SWI images, paramagnetic blood products are sensitive to be screened.

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    At our institution, tractography of the corticospinal tracts and optic radiations is routinely displayed superimposed on high-resolution three-dimensional (3D) T2-weighted and postgadolinium spoiled gradient echo recalled images for intraoperative navigational purposes with additional tracts of interest, such as the arcuate fasciculus, produced in certain cases (Fig. 1H, I, 3D). High-resolution 3D T2* gradient echo sequences such as SWI offer high sensitivity to small regions of magnetic susceptibility,10,11 which includes susceptibility from iron, making susceptibility-sensitive sequences excellent for the depiction of hemorrhage and microhemorrhage (Figs. 1E, 3B and 4D).10,11 The magnitude images depict hemorrhage, blood vessels, and calcification/mineralization as dark lack of signal from susceptibility (see Figs. 1E; 3B, 4D).

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